Eight hundred twenty-six patients with allergic rhinitis were clinically analyzed in our clinic from 1980 to 1984. The incidence of this disease did not increase in relation to the number of outpatients. More than half of the allergic patients visited our clinic before reaching the age of 20. Intracutaneous tests to housedust and Japan ceder were positive in 74.5% and 26.0% patients, respectively. In more than half of the patients positive to house dust allergen, the onset of allergic symptoms occurred by the time the patients were 14 (male) and 19 (female) years old.